This is Santa Barbara's Caitrin McKiernan, left, and her fellow UC Berkeley School of Law student Zoe Luftus-Farren. The two of them authored a paper on how to address the human rights impacts of climate change policy.

Santa even made an appearance at the evening portion of Saturday's rally. Explaining the nastiness that climate change is causing for him, his home in the North Pole, and the elves that help him make the magic happen, Santa explained in a suspicious Eastern European accent, "If we keep this up there will be no more presents kiddies!"

It is the plight of the protesters that has been told around the world since the Wednesday morning protests but it was an equally emotional and no doubt terrifying day for many of the police officers involved in the riots. As bad as it was, it certainly could have been worse and, one of the reasons it wasn't, was because of the restraint shown by many of the men and women in blue.

Human chains and bike walls were just two of the techniques protesters used on Wednesday to try and thwart the advances of the police. Eventually the police took over the truck in the background of the picture.